Required torque loads are set by turning the sleeve until the required setting is opposite the mark. All Britool 3/8in Square torque wrenches indicate with touch, sound and sight when the required torque is reached. This Britool torque wrench range is distinguishable by a length independent mechanism, push through reversible mechanism and a retractable adjustment mechanism, which avoids accidental adjustment. The torque wrench complies with ISO 6789 and is supplied in sturdy plastic storage case.The Britool BRIAVT300A Torque Wrench 3/8 inch Drive has the following specifications:5.0 - 33 Nm.4 -24 ft.lb.3/8 inch Square Drive.Length: 16.5/8 inch.